package com.meis.base.mei.utils;

import android.app.Activity;
import android.graphics.Rect;
import android.view.View;
import android.view.inputmethod.InputMethodManager;

import static android.content.Context.INPUT_METHOD_SERVICE;

/**
 * Created by liujinhua on 15/10/25.
 */
public class SoftKeyBoardListener {
    private View rootView;//activity的根视图
    int rootViewVisibleHeight;//纪录根视图的显示高度
    private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;

    private SoftKeyBoardListener(Activity activity) {
        //获取activity的根视图
        rootView = activity.getWindow().getDecorView();

        //监听视图树中全局布局发生改变或者视图树中的某个视图的可视状态发生改变
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(() -> {
            //获取当前根视图在屏幕上显示的大小
            Rect r = new Rect();
            rootView.getWindowVisibleDisplayFrame(r);
            int visibleHeight = r.height();
            if (rootViewVisibleHeight == 0) {
                rootViewVisibleHeight = visibleHeight;
                return;
            }

            //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
            if (rootViewVisibleHeight == visibleHeight) {
                return;
            }

            //根视图显示高度变小超过200，可以看作软键盘显示了
            if (rootViewVisibleHeight - visibleHeight > 200) {
                if (onSoftKeyBoardChangeListener != null) {
                    onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                }
                rootViewVisibleHeight = visibleHeight;
                return;
            }

            //根视图显示高度变大超过200，可以看作软键盘隐藏了
            if (visibleHeight - rootViewVisibleHeight > 200) {
                if (onSoftKeyBoardChangeListener != null) {
                    onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                }
                rootViewVisibleHeight = visibleHeight;
                return;
            }
        });
    }


    private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
    }

    public interface OnSoftKeyBoardChangeListener {
        void keyBoardShow(int height);// 显示键盘

        void keyBoardHide(int height);// 关闭键盘
    }

    private static SoftKeyBoardListener softKeyBoardListener;

    /**
     * 获取键盘 打开与关闭
     *
     * @param activity
     * @param onSoftKeyBoardChangeListener
     */

    public static void setOnSoftKeyBoardChangeListener(Activity activity, OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {

        if (softKeyBoardListener == null) {
            softKeyBoardListener = new SoftKeyBoardListener(activity);
        }
        softKeyBoardListener.setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
    }


    /**
     * 强制隐藏软键盘
     *
     * @param context
     * @param
     */
    public static void KeyBoardCancel(Activity context) {
        View view = context.getWindow().peekDecorView();
        if (view != null) {
            InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(INPUT_METHOD_SERVICE);
            inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    }

}